repair install_mode support for uid/gid effectively everywhere

We silently dropped all integer values to install_mode since the
original implementation of doing this in KwargInfo, in commit
596c8d4af50d0e5a25ee0ee1e177e46b6c7ad22e.

This happened because install_mode is supposed to convert False
(exactly) to None, and otherwise pass all arguments in place. But a
generator is homogeneous and attempting to do this correctly produced a
mypy error that FileMode arguments were allowed to be ints -- well of
course they are -- so that resulted in the convertor... treating ints
like False instead, to make mypy happy.

Fixes #11538

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